We don't recommend leaving the analog inputs exposed to an input signal when not powered on, for long periods. It's possible extended use may cause permanent damage to the part. You will need to devise a way to protect the ADC inputs in this case.

We don't recommend leaving the analog inputs exposed to an input signal when not powered on, for long periods. It's possible extended use may cause permanent damage to the part. You will need to devise a way to protect the ADC inputs in this case.